On Sat, 08 Nov 2003 09:24:12 -0800, Panama wrote:

I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

The previous owner of our boat installed two radio shack motion
detectors on the overhead aimed at the entry hatches. I haven't felt
the need to use them yet, but I wonder if anyone has some comments on
that approach. We have a cat on board but haven't trained it to bark
yet.

He also installed a switch for major deck lighting at the main
stateroom berth. I think that would help in a crowded anchorage.